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Mastema
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Corrupt Heart item
Corrupt Heart is an unlockable passive item in Mastema, a mod for The Binding of Isaac.
Description
+1 black heart.
+0.25 damage up for each full black heart you have.
All heart types have a 33% chance of being converted into either a 
Black Heart or Black Locusts.
How to unlock?
Defeat The Beast 
Tainted Mastema.
Item pools
Corrupt Heart can be found in the following item pools:
| Name | Weight |
|---|---|
| Devil Room |
1.0/1.0
|
| Curse Room |
1.0/1.0
|
| Demon Beggar |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| summonable | Can be summoned via  Lemegeton. |
| offensive | Can appear for  Tainted Lost. |
| nocantrip | Not available as card effects during the Cantripped! challenge. |
Special synergies
The following special synergies and interactions for Corrupt Heart have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Abyss | Gives a black heart locust that has a small chance to spawn  black locust when damaging an enemy. |
| --- | Fish Tail | Gives double the amount of locusts. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the mod's external Wiki.
- Download Mastema from the Steam Workshop.
Bloodsplosion 
Sinister Sight 
Sacrificial Chalice